How to use Vue to implement gesture password effects

How to use Vue to implement gesture password special effects

Introduction:
With the popularity of mobile applications, gesture password has become a common unlocking method. As a popular front-end framework, Vue provides convenient view layer operations and state management functions, and can well support the implementation of gesture passwords. This article will introduce how to use Vue to implement gesture password effects and provide detailed code examples.

1. Preparation
Before we start, we need to prepare the Vue development environment. The specific steps are as follows:

1. Install Vue, you can install it through the command npm install vue or yarn add vue.
2. Create a new Vue project. You can use Vue CLI to create it. The command is vue create gesture-password or use other methods to create the project.
3. Enter the project directory and start the development server. The command is npm run serve or yarn serve.

2. Implement the gesture password component

1. Create a Vue component named GesturePassword to implement gesture password special effects. The code is as follows:

<template>
  <div class="gesture-password">
    <div v-for="n in 9" :key="n" class="point" :class="{'point-selected': selectedPoints.includes(n)}" @touchstart="touchStart(n)" @touchmove="touchMove(n)" @touchend="touchEnd(n)"></div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      selectedPoints: []
    };
  },
  methods: {
    touchStart(n) {
      this.selectedPoints = [n];
    },
    touchMove(n) {
      if (!this.selectedPoints.includes(n)) {
        this.selectedPoints.push(n);
      }
    },
    touchEnd() {
      // 处理手势密码结束事件
    }
  }
};
</script>

<style>
.gesture-password {
  display: flex;
  flex-wrap: wrap;
  width: 300px;
  height: 300px;
  margin: 0 auto;
}

.point {
  flex-basis: 32%;
  height: 30%;
  margin: 5px;
  background-color: #ccc;
  border-radius: 50%;
}

.point-selected {
  background-color: #ff0000;
}
</style>

2. In the above code, we use a loop instruction v-for to generate 9 points, each point has a corresponding event listener for processing Touch events for gesture passwords. The style of the points is controlled through data binding and conditional rendering, and the selected points are displayed in red.

3. Processing the gesture password end event
In the above code, we only process the start and movement events of the gesture password, we also need to process the end event of the gesture password, and process the gesture password authenticating. We can handle this event by calling a callback function. The code example is as follows:

1. Add a callback function attribute callback in the GesturePassword component:

props: {
  callback: {
    type: Function,
    required: true
  }
}

2. In Call the callback function in the touchEnd method and pass the selected point to it as a parameter:

touchEnd() {
  this.callback(this.selectedPoints);
}

3. Create a Vue component named Home to display the input result of the gesture password, and Handle validation logic. The code is as follows:

<template>
  <div class="home">
    <gesture-password :callback="checkPassword"></gesture-password>
    <div v-if="password">
      <p>您输入的手势密码是：</p>
      <p>{{ password.join(', ') }}</p>
      <p>{{ message }}</p>
    </div>
  </div>
</template>

<script>
import GesturePassword from './components/GesturePassword.vue';

export default {
  components: {
    GesturePassword
  },
  data() {
    return {
      password: null,
      message: ''
    };
  },
  methods: {
    checkPassword(selectedPoints) {
      if (selectedPoints.length < 4) {
        this.password = null;
        this.message = '手势密码长度不能少于4个点！';
      } else {
        this.password = selectedPoints;
        this.message = '手势密码验证通过！';
      }
    }
  }
};
</script>

<style>
.home {
  text-align: center;
  margin: 100px auto;
}
</style>

4. Running and testing

1. Run npm run serve in the command line to start the development server.
2. Open http://localhost:8080/ in the browser, and you will see an interface similar to the nine-square grid.
3. Try sliding your finger within the nine-square grid and observe the color change of the selected point.
4. When your finger is raised, the input result of the gesture password will be displayed on the web page, and corresponding verification will be performed.

Conclusion:
This article introduces how to use Vue to implement gesture password effects and provides detailed code examples. By customizing Vue components to handle touch events and verification logic, we can easily implement gesture password functions. Readers can modify and expand it according to their own needs to achieve more complex gesture password effects.

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